I am sorry i can't exactly help with the price, since I don't remember. But a ball park figure is 150ish? I know its definitely less than 200. I am sure somebody else could give you the exact amount. They are definitely not real diamonds, i think they are crystals. Hope it helps for now, and I am sure somebody else will give you the exact info.
I was online, and saw that they are going for as much as 600 dollars on eBay. Now, I don't think the price jumped that much, when I was at the Chanel store (a couple months ago) they were def. less than 200. I have also seen a lot of fakes online too, if you are going to get them, i would suggest buying them from the store directly to ensure you get the real deal.
I have the smaller Swarovski ones with the silver tone metal, got them at Saks on Rodeo Dr. a couple years ago for $200ish. My hard earned lesson: clean them carefully, because those little rhinestones fall out and I had to pay $50 (!!!) to have them sent back to Chanel and repaired.